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EC number: 273-733-9 | CAS number: 69012-33-5 By-product of the manufacture of silicomanganese alloy containing oxides of aluminum, calcium, magnesium, manganese and silicon.
Endpoint summary
Administrative data
Description of key information
Additional information
SiMn slag is a UVCB substance containing predominantly; magnesium oxide (3.72%), aluminium oxide (12.49%), silicon dioxide (31.8%), calcium oxide (26.02%), barium oxide (1.18%) and SiMn (14%).The substance has very poor solubility in water.
A transformation dissolution study has shown that the concentration of manganese released from the substance (1 µg/L after 28 days from 1mg/L loading) is less than the background concentration of manganese in European environments (15.9 µg Mn/L in surface water, 452 mg/kg in sediment, 428.6 mg/kg in soil).
Exposure to manganese can therefore be concluded to be insignificant and adverse effects on aquatic organisms extremely unlikely.
It is noted that none of the other component metal oxides (magnesium oxide, aluminium oxide, silicon dioxide, calcium oxide barium oxide) are classified for environmental effects. It is additionally worth noting that silicon, magnesium, calcium and manganese are all essential elements at trace levels in living organisms. Based on the physical nature of the substance exposure to these elements via the substance in environmentally relevant conditions is likely to be very low but even if there was exposure toxicity to aquatic organisms can be predicted not to occur.
The substance itself also has a very low solubility in artificial gastric juice (<1%) and even lower solubility (<0.01%) in artificial alveolar fluid (Anderson, 2009). A detailed analysis of particle-size distribution of the substance indicates that over 96% of the substance was greater than 100 µm (Butler and O'Connor 2010; O'Connor and Woolley 2010). Toxicokinetic work in the 90 day study with the registered substance (Cooper, 2016) showed no detectable material in plasma up to the limit dose of 1000 mg/kg bw/day after 7 weeks of dosing. In conclusion, the substance has an extremely low potential for crossing membranes, either as particulate matter or dissolved components and correspondingly there is considered to be very little potential for toxicity in non-target organisms.
It is therefore reasonable to conclude that based on its components the substance as a whole is highly unlikely to demonstrate toxicity to aquatic organisms. It is considered unnecessary to conduct new ecotoxicity studies and further transformation dissolution studies would not provide useful information as it is already known that the metal oxides present in the substance are not environmentally hazardous.
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